<div class="_help_font_site selected-art-author"> <p><strong>a</strong>. For normal single vision glasses, we offer glasses with SPH from -18 to +10, and CYL -4.50 to +4.50.&nbsp;</p> <p><strong>b</strong>. For progressive&nbsp;glasses, the prescription we can make is SPH: -10.00~+6.00, CYL: -4.00~0.00, and ADD: +0.75~+3.50. Sorry we could not make with ADD over +3.50.&nbsp;</p> <p><strong>c</strong>. For bifocal glasses,&nbsp;the prescription we can make is SPH: -8.00~+4.00, CYL: -4.00~0.00, and ADD: +1.00~+3.50. Sorry we could not make with ADD over +3.50.&nbsp;</p> <p><strong>Notice</strong>: With a strong prescription, you are suggested to choose a full frame (better made of acetate material) with narrow and small lens. And high index lenses are necessary.&nbsp;</p> </div>